diff --git a/util/cpt_upgrader.py b/util/cpt_upgrader.py
index e091af4db3..abbaba211d 100755
--- a/util/cpt_upgrader.py
+++ b/util/cpt_upgrader.py
@@ -297,7 +297,7 @@ if __name__ == '__main__':
         print("{")
         print()
         print("std::set<std::string> version_tags = {")
-        for tag in Upgrader.tag_set:
+        for tag in sorted(Upgrader.tag_set):
             print("  \"{}\",".format(tag))
         print("};")
         print()